Method of and apparatus for valving bags



Nov. 3, 1942- H. E, LEE ETAL l f .i .n um X Nov.3,1942. H LEE ETAL 2,300,553`

METHOD OF AND APPARATUS FOR VALVING BAGS Filed sept. 7, 1939 Y 5 sheets-sheet Novi 3, 1942. H. E. LEE ErAL 2,300,553

METHOD OF AND`APPARATUS FOT` VALVING BAGS Filed sept. 7, .1939 sweets-sheet 5 Nov. 3, 1942.

led Sept. 7, 1959 NOW 3, 1942- H. E. LEE' ETAL: 1 2,300,553

MEITHOD 0F AND APPARATUS FOR VALVING BAGS Filed sept. 7, 19739 5 sheets-sheet 5 Patented Nov. 3, 1942 e 2,300,553 METHOD OFAND AIISIRSATUSFOR vALvING Harry E.Lee and Frank M. Holter, Oswego, N. Y., assgnors to St. Regis Paper Company, New York, N; Y., a corporation of New York Application September 7, 1939, Serial No. 293,792

13 Claims.

This invention relates to the valving of bags, and more particularly to applying adhesive between selected portions of the walls of the bag and valve during the valving operation,

More particularly the invention relates to a method of applying adhesive during the folding of the valve and to apparatus for carrying.

out this method,

In valve bags, such as disclosed in Bates et al.

Patent No'. 1,752,292, April 1, 1930 fo`r Paper' bag, a multi-ply paper bag has one corner.

turned in to form a valve, after which the end of the bag is closed, except for the valveV opening, by a sewn seam. The bag isiilled through a tube thrust through the valve. ,After the lling is complete, the tube is withdrawn, and the pressure of material within the bag closes the valve` The paper of the valveis quite heavy* in large bags containing heavy loads, such as cement bags, and unless the valve folds properly, openings are left through which the contents of the bag may sift. `It has been found that adhesion of the valve to the Walls of the bag` at chosen points facilitates the proper folding of the valve, and it is the purpose of this inventionto apply such adhesive advantageously. Y

In the accompanying drawings forming a part of this specification: Y

Figure 1 is a perspective View of valving apparatus embodying the invention;

Figs. 2 to 7, inclusive, are partial perspective views of the valving apparatus showing succes--l sive positionsv during th'e Valving operation;

Fig. 8 is a somewhat diagrammatic -plan view of the paste-applying apparatus of the valver, and

Fig. 9 is an elevation of the paste-applying apparatus.

The apparatus Vcomprises a stationary 'frame providing a table I on which there is mounted a shaft II for oscillation about a pivot I2. .The

`shaft is driven by a suitable belt I3 and carries a roller I4 which is adapted to contact the upper surface of a bag I5 and feed it tothe` right, as viewed in Fig. 1, when the shaft is lowered. When the bag reaches *the position in which it is shown in Fig. l, it contacts the lower end of a switch lever'I6 and operates 4Hsuitalgle mercury, switch within switch box I'I. This closes circuf.

I I and for initiatingthe movement of the valving apparatus proper. j The apparatus for actually .tucking in the Valve comprises clamps v I8, butterfly spreading memts to actuate a solenoid, not shown, for liftingr shaft ber2I andvabutinent plates 22. These are driven by Vsuitabley connections forming no part of the present invention and which need not be described in detail` As indicated above, the rotation of shaft 231s initiated by .th'e movement of lever I6.

` The operation of the switch in a box I'I also initiates the operation vof pasting apparatus which is best shown in Figs. 8 and 9.l This apparatus comprises a slide which is reciprocable in a slideway 26 and is moved by an arm 21' bers I9, a tucking finger 20, a pressing mern-- 55 which may be actuated vby any suitable connections to the driving apparatus. y

The slide 2-5 carries a holder 2l (see Figs. 2, 3 and 4) for glue pads \28.

In the position in which the apparatus is sh'own in Figs. l and 9, the holder 2l and slide 25 are withdrawn from the end .of the bag so that the glue pads are in contact with a glue roller 29 which is rotated and supplied with glue from a pump 30 in ways Which will be obvious without detailed disclosure. The pump. and glue roller are operated by meansk of a motor 3| indicated in Fig. 9.

Mounted upon arockshaft 32 .there are pressure pads 33 which are normally held by a spring 34 in the position vin which' they are shown in Fig. 1.'

The. Agluing apparatus thus f ar described', including the guideway 26, is mounted `in a frame which is slidable ina guideway- 35 substantially at right angles to guideway 26. The frame is adjusted in guideway 35 so that it will be in line` for proper cooperation with the valve devices.'

A frame 40 is pivoted upon brackets suitably supported on the table I0 (see Fig. 1). An arm...

4Ifextends from frame 40 and is operated by a slide 42 which in turn is connected to a, cam, not shown, which is driven in timed relation to the valving apparatus. The frame IIIl carries a plurality of rollers 43' which are constantly driven by a belt 44 from 'any suitable sourceV kof power. When the frame4ll is lowered,ther rollers 43 press upon the upper surface ofa bag which has been valved and discharge it from valving position. i

While the operation of the apparatus has been indicated in connection with 'theA foregoing de- ,.scription, it will ,be briefly reviewed for convenience in understandingthe purpose ofthe invention andthe specific wayJirnwhch it, is carried out in the illustrated example.y A.

Multi-ply paper tubes each of proper length to form a bag, are formed in any suitablemanner. One of these lengths, collapsed and with a gusset fold along the side at the end of which a valve is to be formed, is fed any suitable manner onto the table and slid towards the valving apparatus until its corner is Vcaught beneath roller I4, which continues the forward movement of the tube until its end moves switch lever I6. The movement of I6 effects the lifting of roller I4, and the starting of the valving and pasting apparatus.

By operation of the valving device, the gusset of the tube is held collapsed ata distance from the end Ao`-`the bag by clamps |8rwhile butterfly spreading members are oscillated to spread the gusset closely adjacent to the clamps. .The apparatus is then in the position in which it is shown in Fig. 2.

During the spreading of the butterfiy members, holder 21 with pads v28 has been moved` from its position with the pads in contact with glue roll 29 towards the valve corner of the bag. Continued movement inserts the pads `between the folded in corner 50 of the bag and the spread apart bag walls, as indicated in Fig. 3. Substantially simultaneously with the completion of this movement, rod 32 is oscillated, bringing members 33 against the outside of the turned in corner and pressing the inside of the turned in corner against pads 28 so as to insure the transfer of adhesive from the pads to the inner side of the turned in corner. The members 33 are then swung back and pads 28 withdrawmas indicated in Fig. 4. In this connection, it should be noted that the movement of carrier 21 and pads 28 is in a line substantially parallel with the position of the turned incorner, resulting from the vactionof the butterfly members, the position which thecorner occupies during the application of the adhesive. Y

In the position indicated in Fig. 4, it will be clear from comparison with other figures that the finger 20 contacts the center of the turned in corner and immediately thereafter, as indicated in Fig. 5, member 2| is oscillated to press the sides of the inturned corner against ther p spread apart sides of the bag, as held by members 22. After this operation, the members 20, 2| and 22 are released andthe butterflies returned to their original position, the initial turning of the butterfly spreaders being preferably prior to the withdrawal of members 20 and 2|. walls of the bag as members 20 and 2| are`wthdrawn and insure the return of the spread apart Vwalls to-their original position, if desired.

At the close of the operations just described,

a suitable connection from `the valving apparatus, not shown, results in: the lowering of arm 4I and frame 40 so that rollers 43 contact the.

` length has been fullyl discharged sidewise from the valving position, frame 40 is raised and the circuit is reclosed so that the movement of lever IE can fthen initiate a repetition of the movements just described. The frame carrying roller I4 is also lowered'in operativeposition to feed forward another bag length upon the conclusion of the valving operations, and the lateral movement of the valve bag length.`

It will be seen that a method has been devised in accordance with which adhesive is applied be- Members 22 may follow the spread apart tween the bent in valve corner and-the spread apart walls of the bag during-the valving operation. After the valving has been completed. it would be difficult to introduce this adhesive properly and would require a separate operation to do so. Any attempt to introduce the adhesive prior .to the valving operation `would result'in smearing the adhesive to undesired locations during the valving operation. By applying the adhesive at Vthe moment when the walls are spread apart and the valve corner is bent in, and before the spread apart walls are collapsed upon the bent in corner, it is possible to apply the adhesive without requiring a separate operation and to have it positionedwhere desired without smearing it upon surfaces where it is not desired. The accurate application of the adhesive is sustained by pressing the bent in corner against the pads so as toI insure the transfer of the adhesive to the inner surface of the valve corner and the prompt pressure of the walls'together against the adhesive insures its proper action in uniting the surfaces where desired. It will be seen that this method of operation is very simple, but advantageous.

While one form of apparatus has been dis-- closed, it is clear that the adhesive might be inand the bent over corner, and thereafter bringing the spread apart walls together in their original position 'with the bent in corner therebetween.

2. In valving bags, the method which consists vof spreading apart the walls of a bag tube at its open end adjacent the corner where a valve is to be formed, and bending the wall at said corner towards the median line of the bag, inserting adhesive between the spread apart walls and the bent over corner, thereafter bringing the spread apart walls together in their original position with the bent in corner therebetween, and pressing the walls against the bent in corner where the adhesive is located between them.

3. In valving a gusseted bag, the method which consists in spreading apartthe gusset and side walls of the tube adjacent the corner where the valve islto be formed, bending in the straightened end of the gusset at the corner of the bag, inserting adhesive between the bent in corner andthe spread apart side walls of the bag, and

bringing the spread apart walls together in their original position with the bent in 'corner th'erebetween. l

4. In valving a gusseted bag, the method which consists in spreading apart thegusset and side walls of the tube adjacent the corner where the valve is to be formed, bending in the straightened end of the gusset at the corner of the bag, inserting adhesive between the bent in corner and the spread apart side walls of the bag, bringing the spread apart walls together in their original position with the bent in corner therebetween, and pressing the side walls against the bent in lorner where the Vadhesive is located between 5. Apparatus for valving bags comprising means to spread apart the side walls of a bag adjacent one corner thereof, means to bend the corner between the spread apart side walls and towards the median line of the bag, means to insert adhesive between the bent in corner and the spread apart sides, and means for bringing the spread apart walls together in their original position with the bent in corner therebetween.

6. Apparatus for valving 'bags comprising means to spread apart the side walls of a bag adjacent one corner thereof, means to bend the corner between the spread apart side walls and towards the median line of the bag, means to insert adhesive between the bent in corner and the spread apart sides, means for bringing the spread apart walls together in their original position with the bent in corner therebetween, and means for pressing the walls of the bag against the bent in corner where the adhesive is located therebetween.

7. Apparatus for valving a gusseted bag comprising means to spread the gusset of the bag apart, adjacent one corner and thereby spread the side walls of the bag, means to bend the gusseted corner between the spread apart side walls and towards the median line of the bag, means to insert adhesive between the bent in corner and the spread apart sides, and means to bring together the spread apart walls in their original position with the bent in corner therebetween.

8. Apparatus for valving a gusseted bag comprising means to spread the gusset of the bag apart adjacent one corner and thereby spread the side walls of the bag, means to bend the gusseted corner between'the spread apart side walls and towards the median line of the bag, means to insert adhesive between the bent in corner and the spread apart sides, means to bring together the spread apart walls in their original position with the bent in corner therebetween, and means for pressing the walls of the bag against the bent in corner where adhesive is located therebetween.

9. Apparatus for valving bags comprising means to spread apart theside walls of a bag adjacent one corner thereof, means to bend the corner between the spread apart side walls and towards the median line of the bag, means to insert adhesive between the bent in corner and the spread apart sides, and means for returning the spread apart walls to their original position with the bent in gusseted corner therebetween.

10. Apparatus for valving bags comprising means to spread part the side walls of a bag adjacent one corner thereof, means to bend the corner between the spread apart side walls and towards the median line of the bag atan angle to the side of the bag and slanting towards the open end of the bag, and adhesive-applying means'comprising paste pads and means to move the paste pads in rectilinear lines substantially parallel to the position of the bent in corner and insert the paste pads between the bent in corner and the side walls of the bag.

11. Apparatus for valving bags comprising means to spread apart the side walls of Aa bag adiacent one corner thereof, means to bend the corner between the spread apart side walls and towards the median line of the bag, means to insert adhesive between the bent in corner and the spread apart sides, and means for bringing the spread apart walls together over the bent in corner, the adhesive-applying means comprising pads and means to move the pads'in a line substantially parallel with the bent in corner at the time the adhesive is applied, and means for pressing the bent in corner against the pads.

12. Apparatus for valving bags comprising means to spread/apart the side walls of a'bag adjacent one corner thereof, means to bend the [corner between the spread apart side walls and towards the median line of the bag, means to insert adhesive between the bent in corner and the spread apart sides, means for bringing the spread apart walls together over the bent in corner, the adhesive-applying means comprising pads, means to move the pads in a line substantially parallel to the bent in comer at the time the adhesive is applied, means to apply paste to the pads when they are removed away from the corner, and means to press the bent in corner against the pads when the pads are inserted between the corner and the spread apart walls.

13. Apparatus for valving bags comprising means to spread apart the sidewalls of a bag adjacent one corner thereof, means to bend the corner between the spread apart side walls and towards the median line of the bag, means to insert adhesive between the bent in corner and the spread apart sides, means for bringing the spread apart walls together over the bent in corner, said apparatus comprising a switch controlling the initiation of the movement of the valving mechanism and the adhesive-applying mechanism, means for removing the bag length after the valving operation, and means controlled by the means for removing the bag length for resetting said switch.

HARRY E. LEE. FRANK M. HOLTER. 

